AT25128B and AT25256B SPI Serial EEPROM 128K (16,384 x 8), 256K (32,768 x 8) DATASHEET Features Serial Peripheral Interface (SPI) Compatible Supports SPI Modes 0 (0,0) and 3 (1,1) Data Sheet Describes Mode 0 Operation Low-voltage and Standard-voltage Operation V = 1.8V to 5.5V CC 20MHz Clock Rate (5V) 64-byte Page Mode and Byte Write Operation Block Write Protection Protect 1/4, 1/2, or Entire Array Write Protect (WP) Pin and Write Disable Instructions for Both Hardware and Software Data Protection Self-timed Write Cycle (5ms max) High Reliability Endurance: 1,000,000 Write Cycles Data Retention: 100 Years Green (Pb/Halogen-free/RoHS Compliant) Packaging Options Die Sales: Wafer Form, Waffle Pack, and Bumped Wafers Description The Atmel AT25128B/256B provides 131,072/262,144 bits of Serial Electrically Erasable Programmable Read-Only Memory (EEPROM) organized as 16,384/32,768 words of 8 bits each. The device is optimized for use in many industrial and commercial applications where low-power and low-voltage operation are essential. The AT25128B/256B is available in space saving JEDEC SOIC, TSSOP, UDFN, and VFBGA packages. The AT25128B/256B is enabled through the Chip Select pin (CS) and accessed via a 3-Wire interface consisting of Serial Data Input (SI), Serial Data Output (SO), and Serial Clock (SCK). All programming cycles are completely self-timed, and no separate erase cycle is required before write. Block Write protection is enabled by programming the status register with one of four blocks of Write Protection. Separate Program Enable and Program Disable instructions are provided for additional data protection. Hardware Data Protection is provided via the WP pin to protect against inadvertent write attempts. The HOLD pin may be used to suspend any serial communication without resetting the serial sequence. Atmel-8698E-SEEPROM-AT25128B-256B-Datasheet 0120151. Pin Configurations Table 1-1. Pin Configurations 8-lead SOIC 8-lead TSSOP Pin Name Function 1 8 CS V CC CS Chip Select CS 1 8 V CC SO 2 7 HOLD 2 7 SO HOLD GND Ground WP 3 6 SCK WP 3 6 SCK GND 4 5 SI HOLD Suspends Serial Input GND 4 5 SI Top View SCK Serial Data Clock Top View SI Serial Data Input SO Serial Data Output 8-pad UDFN 8-ball VFBGA V Power Supply CC 8 1 8 1 V CS V CS CC CC WP Write Protect 7 2 HOLD SO 7 2 HOLD SO 6 3 SCK WP 6 3 SCK WP 5 4 SI GND 5 4 GND SI Bottom View Bottom View Note: Drawings are not to scale. 2. Absolute Maximum Ratings* *Notice: Stresses beyond those listed under Absolute Operating Temperature .-55C to +125 C Maximum Ratings may cause permanent Storage Temperature .-65C to +150 C damage to the device. This is a stress rating only and functional operation of the device at Voltage on any pin these or any other conditions beyond those with respect to ground . -1.0V to +7.0V indicated in the operational sections of this specification is not implied. Exposure to Maximum Operating Voltage . 6.25V absolute maximum rating conditions for extended periods may affect device reliability. DC Output Current .5.0mA 2 AT25128B/256B DATASHEET Atmel-8698E-SEEPROM-AT25128B-256B-Datasheet 012015